Cluster formation by charged nanoparticles on a surface in aqueous solution

Dongsheng Zhang, Pedro González-Mozuelos, M Olvera de la Cruz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Clusters of charged nanoparticles in aqueous solutions are analyzed via molecular dynamics simulations. We simulate a two-dimensional system consisting of charged nanoparticles and their corresponding monovalent counterions, with no added salt. The effective pair potentials (EPPs) among these ions are obtained after contracting the water molecules from a full three-dimensional bulk model that explicitly includes the solvent. The dressed interaction site theory (DIST) allows us to adjust the dielectric constant of the solvent to its experimental value and to separate the EPPs among the ions into their short-range and electrostatic (longrange) components. These effective potentials are basically invariant under different ionic concentrations, and the short-range components of those involving at least one nanoparticle are almost independent of the nanoparticle charge. We then use these potentials as the input in our simulations to study cluster formation for different nanoparticle charges at the McMillan-Mayer level of approximation. The structure of the clusters and their net charge (nanoparticles plus absorbed counterions) are also discussed.

Original languageEnglish (US)
Pages (from-to)3754-3762
Number of pages9
JournalJournal of Physical Chemistry C
Volume114
Issue number9
DOIs
StatePublished - Mar 11 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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